Amazon.com: XTAR VC4 Plus Battery 3A Fast Charger, 4 Bay Rechargeable Battery Charger Extend Version for 3.6V 3.7V 18650/20700/21700 Li-ion IMR INR ICR for 1.2V AAA SC Ni-MH Ni-CD with QC3.0 Adapter :
Amazon.com: XTAR VC8 Plus Fast LCD Display Rechargeable Battery Charger with DC36W Adapter max 3A 1 Slots/8 Slots 1A Fast Charge 10400 14500 18650 20700 21700 26650 or AA AAA LI-ION 1.2V
Amazon.com: 18650 to 21700 and 20700 Adaptor Battery Storage Container(18650 to 21-700 and 20-700 Adaptor) : Musical Instruments
Innokin 18650 to 20700 & 21700 Battery Adaptor
DIY USB Power Bank Kit Box for Case 18650 20700 21700 Battery Charger Adapter with LED Flashlight for Mobile Phone - Walmart.com
DIY USB Power Bank Kit Box for Case 18650 20700 21700 Battery Charger Adapter with LED Flashlight for Mobile Phone - Walmart.com